scholarly journals The Effect Of Homogenization Conditions On The Structure And Properties Of 6082 Alloy Billets

2015 ◽  
Vol 60 (3) ◽  
pp. 1763-1772 ◽  
Author(s):  
A. Woźnicki ◽  
D. Leśniak ◽  
G. Włoch ◽  
B. Leszczyńska-Madej ◽  
A. Wojtyna
Keyword(s):  
Solution Heat Treatment ◽  
Rapid Heating ◽  
Structure And Properties ◽  
Alloying Additions ◽  
Large Particles ◽  
Rapid Dissolution ◽  
Fast Dissolution ◽  
Short Annealing ◽  
Si Content ◽  
Research Stage

Abstract The paper presents the results of laboratory homogenization investigations of the 6082 grade alloys, differing in Mg and Si content. At the first stage, the microstructure of alloys was analysed after homogenization finished with water quenching. SEM/EDS investigations and DSC tests were applied to evaluate the dissolution of the Mg2Si particles and concentration of the main alloying additions in the grains interiors, depending on soaking conditions. In the case of alloy with lower Mg and Si content, homogenization the temperature of 535ºC for 8h is sufficient for significant Mg2Si particles dissolution. For the alloy with higher Mg and Si content, after homogenization the temperature of 550ºC for 8h, the amount of undissolved Mg2Si particles decreases visibly, compared to homogenization at 535ºC for 8h. However, an unfavourable tendency of dispersoids growth is observed and these soaking conditions are not found to be recommended. At the second research stage, the influence of homogenization cooling rate on the size and distribution of the Mg2Si particles observed in the alloys microstructure was analysed. The ability of the Mg2Si particles, precipitated during various homogenization coolings, to rapid dissolution was estimated. For this purpose, the hardness after solution heat treatment with short annealing and ageing was determined and the DSC tests were performed. It was found, that cooling after homogenization at 315ºC/h is sufficient for precipitation of fine Mg2Si particles, which dissolve during subsequent rapid heating. Cooling at 40ºC/h, causes precipitation of Mg2Si phase in the form of large particles, unable for further fast dissolution.

scholarly journals The Effect of Cooling Rate after Homogenization on the Microstructure and Properties of 2017a Alloy Billets for Extrusion with Solution Heat Treatment on the Press

2016 ◽  
Vol 61 (3) ◽  
pp. 1663-1670
Author(s):  
A. Woźnicki ◽  
D. Leśniak ◽  
G. Włoch ◽  
P. Pałka ◽  
B. Leszczyńska-Madej ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Cooling Rate ◽  
Solution Heat Treatment ◽  
Rapid Heating ◽  
The Press ◽  
Large Particles ◽  
Rapid Dissolution ◽  
Alloy Microstructure ◽  
Fast Dissolution ◽  
Short Time

AbstractThe influence of cooling rate after homogenization on the 2017A alloy microstructure was analysed. The capability of the θ (Al2Cu) particles, precipitated during various homogenization coolings, for rapid dissolution was estimated. For this purpose, the DSC test was used to determine the effect of the cooling rate after homogenization on the course of melting during a rapid heating. Moreover, the samples after solution heat treatment (with short time annealing) and ageing, were subjected to the microstructure investigations and the microhardness of grains interiors measurements. It was found that cooling after homogenization at 160 °C/h is sufficient for precipitation of fine θ phase particles, which dissolve during the subsequent rapid heating. The cooling at 40 °C/h, causes the precipitation of θ phase in the form of large particles, incapable of further fast dissolution.

Structure and properties of magnetron sputtered Zr–Si–N films with a high (≥25 at.%) Si content

2005 ◽  
Vol 478 (1-2) ◽  
pp. 238-247 ◽  
Author(s):  
J. Musil ◽  
R. Daniel ◽  
P. Zeman ◽  
O. Takai
Keyword(s):  
Structure And Properties ◽  
Si Content

Grain Refinement and Texture Change in Interstitial Free Steels after Severe Rolling and Ultra-Short Annealing

2004 ◽  
Vol 467-470 ◽  
pp. 287-292 ◽  
Author(s):  
Leo Kestens ◽  
Ana Carmen C. Reis ◽  
Wlodzimierz Kaluba ◽  
Yvan Houbaert
Keyword(s):  
Heating Rate ◽  
Grain Refinement ◽  
Rapid Heating ◽  
Annealing Treatment ◽  
Interstitial Free ◽  
Heating Rates ◽  
Texture Change ◽  
Interstitial Free Steel ◽  
Short Annealing ◽  
Textural Development

A Ti-stabilized interstitial free steel was highly cold deformed to a reduction of 95% and subsequently submitted to extremely short annealing cycles with heating rates varying between 300°C/s and 4500°C/s followed by water quench at various temperatures. The microstructural and textural development was studied through various consecutive stages: partially recrystallized, fully recrystallized and after α→γ→α transformation. It was found that irrespective of the heating rate the recrystallization has completely terminated before the onset of the ferrite to austenite phase transformation. In the fully recrystallized condition, ultra-rapid heating gave rise to substantially refined structures with an average ferrite grain size of 6µm. It was also observed that this grain refinement saturates with heating rates beyond 1000°C/s. With regard to the texture formation, the characteristic {111} deep drawing fibre of cold rolled IF steels was observed, irrespective of the heating rate, in an annealing treatment as short as 0.3s. After the forward and reverse α→γ transformation, the ensuing ferrite texture displayed a strong memory effect, as the {111} fibre was even more intense after the double transformation than before.

Correlation between Alloying Elements and Aging Parameters and Hardness and Machinability of Aluminum-Silicon Alloys Using Minitab Software

2015 ◽  
Vol 1101 ◽  
pp. 217-224
Author(s):  
Mahmoud M. Tash ◽  
Khaled A. Abuhasel ◽  
Saleh A. Alkahtani
Keyword(s):  
Artificial Aging ◽  
Drilling Force ◽  
Silicon Alloys ◽  
Aluminum Silicon Alloys ◽  
Alloying Additions ◽  
Surface Fraction ◽  
Solution Treated ◽  
Heat Treated ◽  
Si Content ◽  
Mg Content

The present study was undertaken to investigate the effect of alloying additions and aging parameters (time and temperature) on the hardness and machinability of Al-Si alloys. Hardness, drilling force and moment and number of holes drilled/tool measurements were carried out on specimens prepared from grain refined, Sr modified and heat treated Al-Si alloys. Aging treatments were carried out for the as solution treated (SHT) specimens (after quenching in warm water). The specimens were aged at different conditions; artificial aging was carried out at 180˚C, 200 ˚C and 220˚C for 2 and 5 h. Hardness, drilling force and moment and number of holes drilled/tool as a function of different metallurgical parameters (i.e. %Si content, %Mg content, heat treatment parameters (time and temperature), Cu-intermetallics surface fraction and Fe-intermetallic surface fractions) are analyzed to acquire an understanding of the effects of these variables and their interactions on the hardness and machinability of heat treated Al-Si alloys.

Effects of Si Addition on the Microstructure and Tensile Property of Al-xMg Alloys with Al2Ca during Heat Treatment (x: 5 and 7 Mass%)

2016 ◽  
Vol 877 ◽  
pp. 109-113
Author(s):  
Seong Ho Ha ◽  
Young Ok Yoon ◽  
Shae K. Kim
Keyword(s):  
Heat Treatment ◽  
Tensile Test ◽  
Tensile Property ◽  
Master Alloy ◽  
Solution Heat Treatment ◽  
Artificial Aging ◽  
Raw Material ◽  
Drastic Reduction ◽  
Si Content ◽  
Si Addition

Effects of Si addition on the microstructure, fluidity and tensile property of Al-5/7mass%Mg alloys with Mg+Al2Ca master alloy as Mg raw material were investigated in this study. With 7 mass%Si addition, the fluidity was remarkably improved in both Al-5Mg and Al-7Mg alloys. With increasing the Si content, the amount of the eutectic phases was increased in the microstructures. As a result of the tensile test, there was a drastic reduction in elongation with increasing Si content. Al-5Mg-7Si alloy showed a significant improvement of strength after solution heat treatment and artificial aging.

Effects of Si on Structure and Properties of Mg-Sn Alloy

2013 ◽  
Vol 320 ◽  
pp. 303-307 ◽  
Author(s):  
Hao Ran Geng ◽  
Peng Liu ◽  
Hua Wei Jiang ◽  
Bo Teng
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Tensile Testing ◽  
Chinese Character ◽  
Cast Alloy ◽  
Grain Refining ◽  
Structure And Properties ◽  
And Performance ◽  
Si Content ◽  
Si Addition

Magnesium alloys are becoming ever more prevalent in automotive and aerospace industries as energy conservation and performance demands increase. However, it is limited on further application in the automotive field for its low strength compared with steel and aluminum alloys. Effects of Si addition on microstructure and mechanical properties of as-cast Mg-5%Sn magnesium alloy were also studied using SEM, XRD and tensile testing. The results show that the phases of as-cast alloy are composed of α-Mg, Mg2Sn; Mg2Si. The addition of Si suppresses the precipitation of the Mg2Sn, Product Chinese character shape phases of Mg2Si. With the increase of Si content, the effect becomes more apparent. When Si content is up to 1.25wt%, the grain refining effect reached best level. The average alloy grain size reduced from 90μm to 30μm, the tensile strength is the highest. The average tensile strength increased from 128 MPa to 156 MPa. When the Si added at 1.25wt% or less, the hardness and strength were improved with the increase of Si. When 1.25% Si was added, grain did not become further refinement. While Si content was continue to be increase, the tensile strength decreased.

Comparison of Structure and Properties of Hard Coatings on Commercial Tool Materials Manufactured with the Pressureless Forming Method or Laser Treatment

2010 ◽  
Vol 638-642 ◽  
pp. 1830-1835 ◽  
Author(s):  
Grzegorz Matula ◽  
Mirołsaw Bonek ◽  
Leszek Adam Dobrzański
Keyword(s):  
Surface Layer ◽  
Laser Treatment ◽  
High Speed ◽  
High Speed Steel ◽  
Hard Coatings ◽  
Structure And Properties ◽  
Alloying Additions ◽  
Test Pieces ◽  
Treatment Conditions ◽  
Selection Of

The goal of the work is fabrication coatings with the pressureless forming method or laser treatment retaining the relatively high ductility of the coated tool's core. The paper presents selection of the binder portion and type, and also of the metallic and carbides powders (WC) being the constituents of the polymer-powder slurry which was applied onto the prepared surfaces of the test pieces from the conventional HS6-5-2 high speed steel. This materials was compared with the same conventional HS6-5-2 high speed steel heat-treatable steel after laser treatment conditions and alloying additions contained in WC. Investigation indicate the influence of the alloying carbides on the structure and properties of the surface layer of investigated steel depending on manufacturing conditions and power implemented laser (HPDL). In the effect of laser alloying with powders of carbides occurs size reduction of microstructure as well as dispersion hardening through fused in but partially dissolved carbides and consolidation through enrichment of surface layer in alloying additions coming from dissolving carbides. The resistivity to thermal fatique of laser remelted steel is higher than steel after heat treatment. It shows the possibility of applying the worked out technology to manufacturing or regeneration of chosen hot working tools.

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